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0:4F0h                   Intra-Application Communications Area (ICA)

 Length: 16 bytes

    These sixteen bytes, called the Intra-Application Communications Area
    (ICA) can be used by any program for any purpose. Usually it is used
    to pass data between two or more programs. Not many programs use this
    area. If you wish to use this area, make sure checksums and signatures
    are used to insure the reliability of your data, since another program
    may also decide to use this area.